package com.zmj.commoncore.utils;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * Created by: meijun
 * Date: 2018/10/16 21:02
 */
public class MD5Util {

    public static String getMD5Str(String str) {
        MessageDigest messageDigest = null;

        try {
            messageDigest = MessageDigest.getInstance("MD5");
            messageDigest.reset();
            messageDigest.update(str.getBytes("UTF-8"));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
        }

        byte[] byteArray = messageDigest.digest();

        StringBuffer md5StrBuff = new StringBuffer();

        for (int i = 0; i < byteArray.length; i++) {
            if (Integer.toHexString(0xFF & byteArray[i]).length() == 1) {
                md5StrBuff.append("0").append(Integer.toHexString(0xFF & byteArray[i]));
            } else {
                md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));
            }
        }

        return md5StrBuff.toString();
    }

    private static String passwordAndSalt(String str,String salt) {
        StringBuffer sb = new StringBuffer(str);
        for (int i = 0; i < salt.length(); i++) {
            if(i%2 == 0){
                sb.append(i);
            }
        }
        return sb.toString();
    }
    public static String getMD5Str(String str,String salt) {
        String password = passwordAndSalt( str, salt);
        MessageDigest messageDigest = null;

        try {
            messageDigest = MessageDigest.getInstance("MD5");
            messageDigest.reset();
            messageDigest.update(password.getBytes("UTF-8"));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
        }

        byte[] byteArray = messageDigest.digest();

        StringBuffer md5StrBuff = new StringBuffer();

        for (int i = 0; i < byteArray.length; i++) {
            if (Integer.toHexString(0xFF & byteArray[i]).length() == 1) {
                md5StrBuff.append("0").append(Integer.toHexString(0xFF & byteArray[i]));
            } else {
                md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));
            }
        }

        return md5StrBuff.toString();
    }

    /*public static void main(String[] args) {

        String admin = getMD5Str("admin");
        String admin1 = getMD5Str("admin","830256");
        System.out.println(admin);
        System.out.println(admin1);
    }*/
}
